Effect of nutrition level on reproductive performance of Tan×Small Tail Han crossbred ewes

Abstract

Abstract: The effects of (Ⅰ) 0.8×NRC, (Ⅱ) 0.9×NRC and (Ⅲ) 1.0×NRC levels of metabolic energy (ME) and crude protein (CP) on reproductive performance of ewes during the late period of pregnancy (97-150 d), lactation period (30 d) and flush period (from weaning of lambs to end of the second estrus cycle) were studied. Thirty Tan×Small Tail Han crossbred ewes in lamb at the first or second conceiving stage were randomly divided into three groups (6, 5 and 7 ewes in groups Ⅰ, Ⅱ and Ⅲ respectively were used for statistical analysis). All the ewes were individually housed in pens with lamb creep. 1) During the late period of pregnancy, the postpartum weight of ewes for group Ⅰ (43.50±7.50 kg) was lower than those of groups Ⅱ and Ⅲ (47.20±2.12 and 54.79±6.72 kg). The average daily gain (ADG) of ewes-selves for group Ⅲ (137.4±59.8 g) was greater than those of groups Ⅰ and Ⅱ (-57.7±39.9 and 34.2±56.2 g). Differences in birth weight of lambs (3.82±0.76, 3.86±0.58 and 4.10±0.77 kg respectively) among the three groups were not significant, but litter weight was greater for group Ⅲ (7.69±2.24 kg) than for groups Ⅰ and Ⅱ (5.73±1.34 and 5.40±1.65 kg). 2) During the period of lactation, milk yield of ewes (27.08±4.52, 40.34±11.90 and 55.48±14.29 kg), body-weight (BW) (13.49±3.82, 14.62±3.64 and 19.32±4.45 kg) and body-weight gain (BWG) of litters (7.17±2.71, 9.22±2.17 and 12.28±3.15 kg), BW at weaning (7.71±2.26, 10.45±1.72 and 11.19±2.51 kg) and BWG of lambs (4.10±1.60, 6.59±1.38 and 7.08±2.09 kg) increased with the nutritive levels of ewes. BW of group Ⅰ ewes increased (+0.94±2.053 kg) but for groups Ⅱ and Ⅲ, it decreased (-0.35±2.74 and -1.86±3.89 kg), although there were no significant differences in BWG among all groups. 3) For group Ⅰ, Ⅱ and Ⅲ ewes, BWs at the end of nursing were 46.31±7.61, 46.85±2.58 and 52.93±4.20 kg respectively. The first estrous cycle occurred at 18.60±12.86, 13.25±6.70 and 10.71±4.07 d after cessation of nursing. The ratios of barren ewes at the end of the second estrous cycle were 16.67%, 20.00% and 14.29%, and the lambing intervals were 201.8, 183.5 and 187.7 d.

CLC Number:

S826.3

WANG Hong-bo, GUO Jiang-peng, LI Fa-di, HAO Zheng-li, YAN Ping. Effect of nutrition level on reproductive performance of Tan×Small Tail Han crossbred ewes[J]. Acta Prataculturae Sinica, 2011, 20(6): 254-263.

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